由于病鱼多组织和器官受损及器官功能障碍导致死亡。
The sick fish died by damage and functional impairment of major organ.
组织病理分析表明病原菌导致的感染是全身性的，病鱼的鳍、肝、脾、肾、脑以及鳃等部位都有不同程度的病变。
Histopathological analysis showed that Y13 can cause systemic infection, the target organs including the liver, spleen, kidney, brain, gill and so on.
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